Can siblings fall in love with each other?

Answer 1

Anyone can fall in love with anyone, however human nature is prone to not be attracted to someone you grew up with mostly in the first 6 years of life. This is a evolutionary defense against incest. This also often applies to very old childhood friends, adopted siblings, and foster siblings, but doesn't work for siblings separated at birth and later reunited. This rule is not concrete there are always those cases where it seems to not aplly, but for the most part siblings do not fall in love if they grew up together.